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Mrs Hadfield revealed that Barratt, 22, of Peterlee Place, registered no less than 800 microgrammes of the cocaine metabolite benzoylecgonine per litre of blood, when the legal limit is 50 microgrammes.

And she told the court that Barratt registered 14 microgrammes of cocaine per litre of blood, when the legal limit is 10 microgrammes.